js实现轮播图特效
网络编程 2021-07-04 15:02www.168986.cn编程入门
这篇文章主要为大家详细介绍了js实现轮播图特效，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
本文实例为大家分享了js实现轮播图特效的具体代码，供大家参考，具体内容如下
只需要修改图片的src即可
html:
<body> <div id="rollImgBox"> <div class="photos clearfix"> <!--轮播图里面首位多放一张与第一张图片，以便顺畅平滑切换--> <div class="move"><img src="img/timg%20(7).jpg" alt=""></div> <div class="move"><img src="img/timg%20(4).jpg" alt=""></div> <div class="move"><img src="img/timg%20(5).jpg" alt=""></div> <div class="move"><img src="img/timg%20(6).jpg" alt=""></div> <div class="move"><img src="img/timg%20(7).jpg" alt=""></div> <div class="move"><img src="img/timg%20(4).jpg" alt=""></div> </div> <!--points圆点导航,js动态生成--> <div class="points"></div> <!--如果需要向左与向右的按键，引入方向图片--> <span class="leftPoint"> < </span> <span class="rightPoint"> > </span> </div> </body>
style:
{
margin: 0;
padding: 0;
}
.clearfix{
zoom: 1;
}
.clearfix:after{
content: "";
display: block;
height: 0;
visibility: hidden;
clear: both;
}
#rollImgBox{
/这里让盒子居中，应用到具体页面删除即可/
margin: 20px auto;
/如果该轮播图不是独占一行，需要将其改为行内块元素/
display: block;
position: relative;
/在这里设置装载图片的框框的宽高/
width: 947px;
height: 585px;
/在这里设置边框的样式用outline，这样就不会影响到后面的js了
/加边框，用outline即可，不会影响实际的距离/
outline: 5px solid blue;
overflow: hidden;
}
#rollImgBox .photos .move img{
/在这里设置图片的宽高，与边框的宽高相同/
width: 947px;
height: 585px;
}
#rollImgBox .photos{
position: relative;
/移动的是图片的宽度,左移947px/
left: -947px;
}
#rollImgBox:hover{
cursor: pointer;
}
#rollImgBox .photos div{
float: left;
}
#rollImgBox .points{
position: absolute;
/在这里修改圆点导航的位置/
bottom: 30px;
right: 170px;/右下方/
text-align: center;
}
#rollImgBox .points span{
display: inline-block;
/在这里可以更改圆点的大小/
text-align: center;
line-height: 66px;
font-size: 24px;
font-family: 微软雅黑;
width: 66px;
height: 66px;
background: rgba(112,117,112,.6);
border-radius: 50%;
margin-left: 15px;
}
#rollImgBox .points .pointsNow{
background: rgba(62,255,49,.6);
}
/左右按钮/
#rollImgBox .leftPoint{
width: 60px;
height: 60px;
background: rgba(0,0,0,.5);
text-align: center;
line-height: 60px;
position: absolute;
font-size: 30px;
color: white;
: 290px;
left: 0;
}
#rollImgBox .rightPoint{
width: 60px;
height: 60px;
background: rgba(0,0,0,.5);
text-align: center;
line-height: 60px;
position: absolute;
font-size: 30px;
color: white;
: 290px;
right: 0;
}
#rollImgBox .leftPoint:hover{
background: rgba(255,0,0,.5);
}
#rollImgBox .rightPoint:hover{
background: rgba(255,0,0,.5);
}
script:
window.onload = function(){
let rollImgBox = document.querySelector("#rollImgBox");
let photos = document.querySelector("#rollImgBox .photos");
let allimg = document.querySelectorAll("#rollImgBox .move img");
let index = 2;
//动态设计移动图片的框框宽高
//(rollImgBox.offsetWidth)是要剪去边框的宽度
photos.style.width = (allimg.length)(rollImgBox.offsetWidth) + "px";
photos.style.height = rollImgBox.offsetHeight + "px";
//动态创建小圆点
let point = new Array();
let points = document.querySelector("#rollImgBox .points");
for (let i=0;i<(allimg.length-2);i++){
point[i] = document.createElement("span");
point[i].innerHTML = (i+1);
points.appendChild(point[i]);
}
point[0].className = "pointsNow";
let rollImgIterval = setInterval(function () {
//图片的轮播
if (index === allimg.length){
photos.style.left = 0;
index = 1;
photos.style.transition = "0s";
point[0].className = "pointsNow";
} else {
photos.style.transition = "1.5s";
}
photos.style.left = -(rollImgBox.offsetWidth)index + "px";
index++;
//小圆点的变换
for (let j=0;j<(allimg.length-2);j++){
if (j === index-2){
point[j].className = "pointsNow";
} else {
point[j].className = "";
}
}
//这里是一张图片（与展现的第一张一样的图）设置小圆点样式
if (index === allimg.length){
point[0].className = "pointsNow";
}
},2000);
//当用户把鼠标放到rollImgBox盒子中，需要查看图片，自动轮播停止
rollImgBox.onmouseover = function () {
clearInterval(rollImgIterval);
};
rollImgBox.onmouseout = function () {
rollImgIterval = setInterval(function () {
//图片的轮播
if (index === allimg.length){
photos.style.left = 0;
index = 1;
photos.style.transition = "0s";
point[0].className = "pointsNow";
} else {
photos.style.transition = "1.5s";
}
photos.style.left = -(rollImgBox.offsetWidth)index + "px";
index++;
//小圆点的变换
for (let j=0;j<(allimg.length-2);j++){
if (j === index-2){
point[j].className = "pointsNow";
} else {
point[j].className = "";
}
}
//这里是一张图片（与展现的第一张一样的图）设置小圆点样式
if (index === allimg.length){
point[0].className = "pointsNow";
}
},2000);
};
//点击小圆点，跳转到对应的图片位置
for (let k=0;k<(allimg.length-2);k++){
point[k].onmousedown = function () {
photos.style.left = -(rollImgBox.offsetWidth)(k+1) + "px";
//小圆点的变换
for (let j=0;j<(allimg.length-2);j++){
if (j === k){
point[j].className = "pointsNow";
} else {
point[j].className = "";
}
}
//点击小圆点之后更改index的值
index = k+2;
}
}
//点击左右方向键，对图片进行滑动
let leftPoint = document.querySelector('#rollImgBox .leftPoint');
let rightPoint = document.querySelector('#rollImgBox .rightPoint');
leftPoint.onclick = function () {
photos.style.transition = "1s";
//向左滑动一张图片，并修改index的值（index--）
let dis = index-2;
//当dis为1时，圆点到达第一个位置，如果再往左移动一个，圆点应该到达一个位置
if (dis < 1){
dis = allimg.length-2;
photos.style.left = 0;
point[dis-1].className = "pointsNow";
point[0].className = "";
index = allimg.length;
} else {
photos.style.left = -(rollImgBox.offsetWidth)dis + "px";
point[dis-1].className = "pointsNow";
point[dis].className = "";
}
//从第一张顺滑切换到一张
setTimeout(function () {
if (photos.style.left === '0px'){
photos.style.left = -(rollImgBox.offsetWidth)(allimg.length-2) + "px";
photos.style.transition = '0s';
index = allimg.length-1;
}
},1000);
index--;
};
rightPoint.onclick = function () {
photos.style.transition = "1s";
//向右滑动一张图片，并修改index的值（index++）
let dis = index-1;
//当dis为5时，圆点到达一个位置，如果再往右移动一个，圆点应该到达第一个位置
if (dis >= (allimg.length-2)){
photos.style.left = -(rollImgBox.offsetWidth)(allimg.length-1) + "px";
point[0].className = "pointsNow";
point[allimg.length-3].className = "";
index = 1;
} else {
photos.style.left = -(rollImgBox.offsetWidth)index + "px";
point[dis].className = "pointsNow";
point[dis-1].className = "";
}
//从一张顺滑切换到第一张
setTimeout(function () {
if (photos.style.left === ((-(rollImgBox.offsetWidth)(allimg.length-1))+'px')){
photos.style.left = -(rollImgBox.offsetWidth) + "px";
photos.style.transition = '0s';
index = 2;
}
},1000);
index++;
};
};
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